Reversible brush-holder for dynamos.



J. L. CREVELENE REVERSIBLE BRUSH HOLDER FOR DYNAMOS.

APPLICATION F ILED SEPT25. 19H.

Patented Dec. 14, 1915.

kinnulzir n'i z cnet QFFEZEQ T SAFETY CAP. HEATING AND N NEW on.

To (ZZZ whom 525 may concern Be it known that l, JOHN l1. a resident o" New York, in the State of l York. have invented.

Commune,

cerisin new and usel ul improvements in Reversible Brush rollers for Dvnsinos, as set iorih in the annexed specification end (lia sing. llorre .1 Pill thereof.

My involution pertains lo class of o vnuinos in which the urinal-lire is subject to reversiils in direction of rotation encl has for its particular object to provide means whereby current deliver-eel by the dyno will remain uni-clirectionol regardless of such reversals.

il'e igure l is 2. partial longitudinal section and elevation of s portion of the (lynziino comprehending my invention. Fig. is :i transverse "action of the dynamo shown in l on the line fir- 3 as viewecl from ghc right. l is u plan of one of hc brush carrying members shown in Ill K" Y r rigs. A. and ii.

in "he cl. i ving, 1 represents the srinzivure 2 oi? the g nerator provided with the usual commutator and carried by the shaft- 3., one encl oi. which is supporting in the usual hearing curried, within the hearing her provi col with the lunged no clinched, screws (l to the shell or iiehl frame Y. no member l carries the ironic 8 which may he formed "'zil therewith if desired provided with u. winding 9 so as to form an annular elcctromugnec having in relation thereto armoiure or shoes ii) of magnetic material provided with urine ll. so

inched lo and insulated. from brush cor *ying" 1 1-? 0 1v rouno we coniniuluioi 4 as slioiln in big. The member 4 is provided Wlllll a hub lfl 'which curries flanges 19 in such manner as to fo. s recess Within which are placed rollers 26 attached to the arms 11 or cl thus these rollers and flanges will hold the brush Specification of Letters Patent.

counzy and operative Po'lsenreil. lfileeu 14, 1915.

plicetieu filell Seotemoer '55, Serial No. 652,053

carrying; members from lateral play. The brush carrying; members are each provided wish an angular conducting member 21 iii;- tz'icliecl thereto to which may be connected the leads and, as the entire brush curryinechanisin will tend to revolve with the commutator and us it is desirable to arrest hiis revolution so as to hold the brushes in cerniin ii-ted positions, I utilize the leads 22 for this purpose. fherei'ore, the leads are flexible and are siituched to midiizional conducting members 23 insulated from the frame 7 as indicated in Fig. H,

the brushes of a four pole machine shifiiecl from one axis of commutathut of opposed polarity by revolu- 90 degrees, I so position the memas he to of 22, my degrees from the position pre uisly occug'iiecl. Hence, the direction of current delivered to line will remain constant regardless the direction of rotation of she armature in an obvious manner.

The operation of my invention is substanbislly as follows: If rho armature revolve slowly in such direction that its uppermost port in Jig. I, is moving toward the observer, or is moving in o. counter-clockwise direction. viewing Fig. H, the brushes will he in the positions shown in Fig. 11 and the scrubbers will he clrsvvn upon the commutator in such manner -20 clean and polish the same. if the generator speed be increased until its vollzoge is appreciablo or that sufficient so be useful, the winding 9 which is preferably placed. in shunt across the brushes will he energizecl and caused lo new the shoes zinil lif' the scrubbers free fromlhe commutator. The brushes l3, however. will remain upon the commutator in operative relotion thereto owing to the action of the suring brush holders shown in the drawing. l1 now ihe armature continue to revolve, the

brush mechanism will all be held firmly in pluce o v the mag. et 89 which Willfirmly grip and hold the shoes 10, thus avoiding undue strain on the leads 22. If new the and arrange the length of the leads armatiu'e become stationary, the shoes will be released and the brush mechanism the position shoivn in lfigs. l j the armature now be revolved in reverse direction, the brushes will revolve with the commutator through 90 degrees and then be arrested by the leads 22.

bl? then the speed increase suiiiciently the magnet 89 will again attract the shoes 10 nd lift the scrubbers free from the arma- ;ure and hold the brush rigging firmly in )roper position and the current delivered to .inc will remain of the same polarity owing to the new position occupied by the brushes. will. be observed that the arc through which the brushes are shifted when the dynamo reverses is determined by the lengths of the conductors 22, these conductors stopping; the movement of the brushes in either direction.

make no *laim herein to a plurality of brill-shes rotatably held upon the commutator and adapted to be held from rotation at pre determined points by magnetic means, since such subject-matter is covered in claims of my (ac-pending application filed the 7th day of August, 1911, Serial No. (342,582; nor do 2. claim herein brush-holders in operative relation to the commutator together with electromagnetic means for supporting said ln-ush-holders out of contact with any of the moving parts of the machine, since said subject-matter covered by claims in my patent granted April 15, 1913, No. 1,058,730.

I do not Wish in any Way to limit myself to the exact construction shown in the drawi which is given merely to illustrate one type oi dynamo conu'lrchending my inventor it is obvious that Wide departure v be made in the Way of construction thout departing from the spirit and scope of: my invention "which is z set forth in the following claims:

llleaus tor commutating the current of a dynamo electric machine embracing a commutator, a inurality of brush carrying members mechanically connected together and holding commutating brushes, means for securing the brushes, when in proper place, l'rom chattering, and a plurality of arms connecting said means to the brush carrying members.

52. lvieans for comu'iutating the current ol a dynamo electric machine embracing a cozruuitator. a plurality oi" brush carrying 3.21 :aibr-rs i'ucclmnically connected trgcthcr and holding); cominutating brushes, a pluralitv oi" insulating devices connected with said brush carrying members and bearing oi 'frictionally upon ihc commutator; together with means for restraining the movement of the brushes in opposite (.lircctions.

3'. llicans i'or connnutaling the current of a d naino electric machine embracing a commutator, a plurality of brush carrying menihers mechanically connected together and holding commutating brushes, means for s curing the brushes, when in proper place, from chattering, and a plurality of arms connecting said means to the brush carrying members; together with means for restraining the movement of the brushes in opposite directions.

l. in a generator provided with an armature and commutator, the combination of brushes in operative relation to said commutator, means carried by said commutator for mounting said brushes subject to movement with said con'imutator, and m ans for restraining the movement of said brushes, said brush-mounting means comprising means resting on the commutator for supporting said brush-mounting means.

in a generator provided with an armature and commutator. v the combination of brushes in operative relation to said commutator, means iarried by said conm'iutator for supporting said brushes and allowing movement with said coimnutator, means for restraining said movement and electromagnetic means for supporting said brush carrying means.

('3. The combination with a commutator, of brush carrying mechanism supported by said conmmtato" and electromagnetic means for relieving the commutator of said brush carrying mechanism and supporting" the same.

7. The combination with a commutator of brush carrying mechanism carried thereby and tending" to revolv; therewith, means for restraining the revolution thereof at predetermined points allowing the brushes to travel with the connnutator to proper ends of axis ofcommutation to hold the current direction uniform throughout reversals in direction of the commutato and elcctromagnctic means for relieving the connnutator of the brush carrying mechanism and holding the same in iixcd positions.

8. The combination with a generator provided with a commutator; of a plurality of brushes in operative relation to the commutator; means for securing said brushes together so that they may move as a unit relatively to the commutator, and flexible means for arresting the n'iovcnient oi said brushes at a predetermined point in their movei'nent.

The combination with a generator provided with a con'imutator, of a plurality of brushes arranged in operative relation to said commutator; mums for securing said brushes together so that they may more as a unit relativclvto the commutator; flexible means for limiting); the movement of the brushes; and additional means for restraining: the movement of said brushes so as to avoid undue strain upon the flexible means.

14". The combination with a generator pro vided with a commutator, of a plurality of brushes arranged in operative relation to said commutator; means for securing said brushes together so that they may move as a unit relatively to the commutator; flexible means for limiting the movement of the brushes; and magnetic means for .hololing the brushes from movement to thereby re lieve the flexible means from undue strain.

11. The combination With a. generator provided with a commutator, oi plurality of brusl'i-holders arranged in operative relation to the connnutator, said brush-holders carrying scrapers and brushes in cooperative relation to the commutator.

12. The combination with a generator provided With a commutator, of a plurality of brush-holders arranged in operative relation.

to the commutator, said brusl'i-holders carrying brushes and scrapers in cooperative relation to the commutator; and means for lifting the scrapers from operative position during, predetermined periods in the operation of the commutator.

13. The combination with a generator provided with a commutator, of brush-holders in operative relation to the commutator, each of said brush-holders carrying a fixed scraper and a movable brush in cooperative relation to the commutator; and means for lifting the scrapers out of operative posi tion during predetermined periods in the operation of the commutator.

14. The combination with a generator provided With a commutator, of a plurality of brush-holders arranged circumferentially of the commutator and in operatiye relation thereto; means for yieldinglvfliioining the brush-holders together so that they may move as a unit relatively to the commutator; brushes and scrapers carried by the brushholders; means for limiting the movement of the brush-holders relatively to the commutater; and means for moving the scrapers from cooperative relation to the commutator, at predetermined periods during the operation of the latter.

15. in combination With a generator provided with a commutator, of a brush-holder arranged in cooperative relation to the commutator, said brush-holder having a brush yioldingiy pressed into engagement with the commutator, and a scraper fixedly held for engagement with the commutator.

16. In combination with a generator provided with a commutator, or" a brush-holder arranged in cooperative relation to the commutator, said brush-holder having a brush yieldingly pressed into engagement with the commutator, a scraper fixedly held for en gagement with the commutator, and means for lifting the scraper from engagement with the commutator Without disturbing the relation. of the brush thereto.

JOHN L. CREVELING. i itnesses A. M. 'WALL, l'ill. E. HiLLocn. 

